/******************************************************************************
 * Copyright (C) 2015  671643387@qq.com
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *****************************************************************************/

#ifndef SHARED_AUTH_AUTH_CRYPT_H_
#define SHARED_AUTH_AUTH_CRYPT_H_

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif

#include <cstddef>
#include <cstdint>
#include <vector>
#include "node/macros.h"
#include "node/crypto/bignumber.h"

class AuthCrypt
{
public:
    AuthCrypt(void);
    ~AuthCrypt(void);

    const static ::std::size_t CRYPTED_SEND_LEN = 4;
    const static ::std::size_t CRYPTED_RECV_LEN = 6;

    void Init(void);
    void SetKey(::std::uint8_t *key, ::std::size_t size);
    void DecryptRecv(::std::uint8_t *data, ::std::size_t size);
    void EncryptSend(::std::uint8_t *data, ::std::size_t size);
    inline bool IsInitialized(void) const {
        return inited_;
    }

    static void GenerateKey(::std::uint8_t *key, ::node::crypto::BigNumber *bn);

private:
    ::std::vector<::std::uint8_t> key_;
    ::std::uint8_t send_i_, send_j_, recv_i_, recv_j_;
    bool inited_;

    DISALLOW_COPY_AND_ASSIGN(AuthCrypt);
};

#endif // SHARED_AUTH_AUTH_CRYPT_H_
